Is your feature request related to a problem? Please describe.
I store many PDFs in my Cloudreve instance. I would love to search for the content in my PDFs via the global search, so I can find them again more easily.

Describe the solution you'd like
I would like to enter stuff from inside my PDFs in the global search bar to find the PDF itself.

Describe alternatives you've considered
There is no real alternative. The alternative is to know, where the PDF is.

Additional context

Being able to search for the PDF content here